Malicious PDF — malware analysis report

Static analysis result for SHA-256 175fb441fe49bb76…

MALICIOUS

PDF

49.4 KB Created: 2020-08-21 15:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1e7aac1ee1ee91aec54a7ca6817513b SHA-1: 3f31b1bdf72a734c5182601230f4c998ea28e430 SHA-256: 175fb441fe49bb76f3e22c96c8960c31e9d9ffb01a70edfd2e9e113abd3d83c3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which are designed to appear as legitimate documents but lead to a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, and PDF_MALICIOUS_REDIRECTOR_LINK confirms that at least one of these links points to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=quantum+ontology+peter+lewis+pdf
    • http://lapitaji.johndinser.com/uploads/1/3/0/7/130740082/6211819.pdf
    • http://files.bridgeandcivil.com/uploads/1/3/0/8/130813427/38e30.pdf
    • http://files.smcountynewcomers.org/uploads/1/3/2/8/132814593/dixaxifafejal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/fairy_tail_2014.pdf
    • https://cdn.shopify.com/s/files/1/0434/2988/8161/files/basic_aix_commands_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5279/files/is_megaup_safe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/laweziz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3391/0681/files/free_chrome_browser_offline_installer.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/17666230788.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/mah_llb_cet_2019_hall_ticket.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/voxof.pdf
    • https://cdn.shopify.com/s/files/1/0434/2199/1079/files/govozox.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/65424485204.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2858/files/kevunumineworojuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1569/files/more_dimensional_analysis_problems_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/3031/4133/files/71683318899.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000839a.bin
553ce951a15ab4de5fc7ac0bc72d23abdb3c88711c0fef250be31e5adb2ac201		 pdf-font-stream PDF embedded font (sfnt) at offset 0x839A 5616 bytes
font_01_sfnt_off000096bb.bin
6fff2d70518897824dbf8a9f836f0c9e3506f4dc242428a87dba765d5dd40cac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96BB 9800 bytes

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